On Sun, 2017-06-25 at 18:37 -0400, Christopher Williamson wrote:
> 4.8 and 4.12-rc6
> 
I just gave a quick test on a HP Cherrytrail laptop with 4.12 tip.
Attached is the output, which show that this does scale.
It is possible that you don't have any idle (C-states) or some task is
keeping system busy.

I suggest:
1. Run turbostat and attach output.
2. Attach output of tools/power/x86/intel_pstate_tracer for a minute
run.

Thanks,
Srinivas

> On Jun 25, 2017 at 10:24 PM, "Rafael J. Wysocki" <rjw@rjwysocki.net>
> wrote: 
> > On Sunday, June 25, 2017 03:39:11 PM Christopher Williamson wrote:
> > > Hi there,
> > >
> > > I've just purchased a device called a "GPD Pocket" (more info at
> > > indiegogo.com/projects/gpd-pocket-7-0-umpc-laptop-ubuntu-or-win-
> > 10-os-laptop--2/x/7959405)
> > > but in short - one of the major problems I have with the device
> > is that the
> > > included Intel Atom Z8750 never clocks below the turbo boost
> > speed meaning
> > > it overheats very quickly and crashes.
> > >
> > > I have managed to avoid this behaviour in two ways:
> > >
> > > 1.) Disable turbo boost - the device then sits firmly at 1.6GHz
> > and refuses
> > > to clock below that.
> > >
> > > 2.) Disable the intel_pstate driver and the CPU then clocks
> > properly but
> > > cannot turbo boost at all so I lose that capability.
> > >
> > > I'm really just reaching out to you fine folks to find out where
> > best to
> > > discuss this issue. I'm happy to raise a kernel bug report if
> > that helps
> > > and also happy to provide command outputs as needed.
> > >
> > > I have included Hans de Goede in the CC list on this email since
> > he has
> > > been a great help getting to this point - this device has a few
> > strange
> > > quirks to work through but this is a fairly serious one.
> > 
> > What kernel versions have you tried?
> > 
> > Thanks,
> > Rafael
> > 
> > 
> >